짚다 is placing a finger or hand on a point, literally (여기서 이렇게 짚는 게 아니라, don't press here) or on an issue. 짚고 넘어가다 — put your finger on it before moving on — is the set phrase for settling a point instead of letting it slide: 이거 확실하게 짚고 넘어가야 돼요. 정확하게 짚다, in four of these lines, means getting the point exactly right, whether a musical pitch or someone's argument.